After undergoing neck surgery in 2011, Denver quarterback Peyton Manning bounced back and has had a record-breaking season for the Broncos.

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They were passes Eli Manning had never seen from his older brother Peyton.

"No pop. No zip. The ball barely traveled 15 yards," Eli recalls. "It was like he had no follow through. It didn't seem to be coming out of his hand right. And he kept looking over at me and asking, 'Does it look normal?' I didn't know what to say. Honestly, I was scared for him."

That was in January 2012, barely four months after Peyton underwent his fourth neck surgery in a span of 18 months to repair damage from the wear and tear of playing football since junior high. He missed the Indianapolis Colts' 2011 season after surgeons ...